[riot-notifications] [RIOT-OS/RIOT] examples: add TCP echo server & client from documentation (#16739)
notifications at github.com
Sun Sep 19 06:50:23 CEST 2021
> > Shouldn't `gnrc_pktbuf` take care of holding the memory of the packet? Why do we need to copy it to a second buffer?
> IIRC, the current `gnrc_tcp` implementation is not zero-copy. At some point you need to reassemble the TCP segments, so I guess this is where the second buffer comes in. Why `gnrc_pktbuf` is not used as the space where this happens, I cannot remember.
Exactly. The so called receive buffer holds the received payload until a user reads it. gnrc_pktbuf is only used to for packet data in transit. Keeping both seperate reduces the risk of running out of memory in gnrc_pktbuf in cases where the user does not read received data. This is important then multiple connections are used in parallel.
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the notifications